Crop Journal (Jun 2024)

Rice melatonin deficiency causes premature leaf senescence via DNA methylation regulation

  • Yue Lu,
  • Ahmed Gharib,
  • Rujia Chen,
  • Hanyao Wang,
  • Tianyun Tao,
  • Zhihao Zuo,
  • Qing Bu,
  • Yanze Su,
  • Yaoqing Li,
  • Yanmo Luo,
  • Hamdi F. El-Mowafi,
  • Zhichao Wang,
  • Qianfeng Huang,
  • Shuting Wang,
  • Yang Xu,
  • Pengcheng Li,
  • Chenwu Xu,
  • Zefeng Yang

Journal volume & issue
Vol. 12, no. 3
pp. 721 – 731

Abstract

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In a study of DNA methylation changes in melatonin-deficient rice mutants, mutant plants showed premature leaf senescence during grain-filling and reduced grain yield. Melatonin deficiency led to transcriptional reprogramming, especially of genes involved in chlorophyll and carbon metabolism, redox regulation, and transcriptional regulation, during dark-induced leaf senescence. Hypomethylation of mCG and mCHG in the melatonin-deficient rice mutants was associated with the expression change of both protein-coding genes and transposable element-related genes. Changes in gene expression and DNA methylation in the melatonin-deficient mutants were compensated by exogenous application of melatonin. A decreased S-adenosyl-L-methionine level may have contributed to the DNA methylation variations in rice mutants of melatonin deficiency under dark conditions.

Keywords